John Gill Commentary Ezekiel 28:19

"All they that know thee among the peoples shall be astonished at thee: thou art become a terror, and thou shalt nevermore have any being." — Ezekiel 28:19 (ASV)

All they that know thee among the people shall be astonished at thee

At your fall; that such a mighty city, and powerful prince, should be destroyed at once; that, from such a height of prosperity, they should be brought to so low an estate of adversity; this will be the astonishment of kings, merchants, and others, that knew the riches, power, and flourishing estate of Rome, as before observed.

you shall be a terror;

to the said persons, who will be afraid to come nigh for fear of the same torments and punishment (Revelation 18:10Revelation 18:15). Or, though you "have been a terror"; or "terrors"; exceeding terrible to others in time past, yet now, as the Targum, "I will give you (or make you) as if you were not:"

and never shall you be any more;

as you have been, or after your last destruction; so mystical Tyre or Babylon shall be no more, when once destroyed (Revelation 18:21).